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| year | consumption | change |
| 1980 | 2.23 | NA |
| 1981 | 2.50 | 12.11% |
| 1982 | 2.89 | 15.60% |
| 1983 | 3.62 | 25.26% |
| 1984 | 3.89 | 7.46% |
| 1985 | 3.65 | -6.17% |
| 1986 | 3.88 | 6.30% |
| 1987 | 4.47 | 15.21% |
| 1988 | 4.35 | -2.68% |
| 1989 | 4.02 | -7.59% |
| 1990 | 4.52 | 12.44% |
| 1991 | 4.83 | 6.86% |
| 1992 | 5.50 | 13.87% |
| 1993 | 5.62 | 2.18% |
| 1994 | 6.01 | 6.94% |
| 1995 | 6.13 | 2.00% |
| 1996 | 7.17 | 16.97% |
| 1997 | 8.00 | 11.58% |
| 1998 | 8.26 | 3.25% |
| 1999 | 9.22 | 11.62% |
| 2000 | 9.83 | 6.62% |
| 2001 | 11.11 | 13.02% |
| 2002 | 12.45 | 12.06% |
| 2003 | 14.01 | 12.53% |
| 2004 | 14.81 | 5.71% |
| 2005 | 16.58 | 11.95% |
| 2006 | 17.09 | 3.08% |
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